When I started my weight gaining exercises, I felt my workout was not enough, and that my body needed more to cut the weakness out and help me gain the appropriate amount of weight to build muscle. I feel that Optimum Nutrition Pro Gainer could have helped me a lot. Read this ON Pro Gainer review for more.

Things to Consider Before Buying

If you are looking to gain healthy weight while maintaining proper nutrition, you might want to consider a weight-boosting protein powder.

Why is a weight gainer helpful, and why should I buy it?

Weight gainers can be useful in some situations, especially for individuals that want to boost their muscles while they work out. It offers a major advantage for anyone that may not get enough food in their day when they work out, or that want to boost their calories.

Not only that, but weight gainers can be used as an on the go meal. It will help you satiate your hunger at any time and place without having to pack large amounts of food for yourself on the go.

Who should not consume weight gainers?

If you are someone who has a normal appetite naturally, you can avoid consuming weight boosters by keeping a high-calorie diet. Furthermore, since these types of supplements can negatively impact the kidneys or liver with prolonged use, individuals that already have issues in these organs may want to choose dietary changes, rather than a supplement.

If not weight gainers, then what?

The best replacement for a weight gainer is your routine food. Choose foods with a high-calorie count or speak with a nutritionist to find the safest way to add these foods. Focus on high-protein foods if the reason behind this is to gain muscle mass.

Things to consider before buying a weight gainer

  • Weight gainers will give you exactly what naturally occurring food can give you.
  • Weight gainers can negatively impact your kidneys and liver. They may also cause breathing issues.
  • They help if you have a small appetite or if your routine allows you to eat only large meals after long gaps.
  • Weight gainers are usually made up of 70% carbohydrates, about 20% protein, and 10% fat.
  • A typical serving can give you about 1000 calories, but this can also be easily achieved by having normal food.

Optimum Nutrition Pro Gainer Review

Optimum Nutrition Gainer is a weight and mass gaining protein powder that helps you bulk up, rather than slim down. It supports the need for a bigger body, which is both helpful during a muscle-focused workout and for individuals that might be under their goal weight. At 650 calories per serving, it could easily be used as a meal replacement shake, but also keeps the body from losing essential nutrients.

With a rich assortment of vitamins, minerals, and carbohydrates, this product serves a much broader purpose than other whey-based formulas on the market today. Even when compared to leaders in the market, it exceeds the carbohydrates and calories to ensure growth.

In every serving, Optimum Nutrition Pro Gainer offers a total of 60 grams of protein, as well as 85 grams of carbs. The average person doesn’t need much more than these amounts in their entire day, so Optimum Nutrition Gainer is primarily for the people that want to add the weight, rather than those who try to lose it.

When it comes to flavor, this brand still has you covered with Vanilla Custard and Double Chocolate.


  • Mixes well
  • Comes in a variety of flavors
  • Good taste
  • Higher protein content
  • Trusted brand


  • Can sometimes be hard to digest
  • The taste may vary from order to order
  • High sodium content

Features & Benefits

Optimum Nutrition Pro Gainer comes packed with a lot of benefits and presents some unique features ranging from price to taste. This mass gainer offers the customers a wide range of choices and is also easy on the stomach and pockets – making it all the more desirable. Some of the features, as well as benefits, include:

Easy to digest

When you take a supplement, you expect that it is easy to consume and is taken well by your body. Optimum Nutrition Pro Gainer does exactly that. It is light and is easily digested by the body.

This means that there would be little to no discomforts during workouts after consuming this protein powder. It also protects your gut health to the maximum.

Minimum added sugar

Optimum Nutrition Pro Gainer is packed with very little amounts of sugar. It does not have more than 4 grams of added sugars which helps you gain the confidence that while you are trying to choose a healthy protein supplement for yourself, you are not stuffing yourself with unnecessary sugar.

This is especially necessary when you are trying to gain weight cleaner. Extra sugar will certainly facilitate weight gain but will not keep your body in an overall healthy condition.

Good protein to carb ratio

Even though you are consuming a mass gainer, you do not want just proteins to be able to sustain. Your body needs much more and therefore a good health supplement will have much more nutritional value than just proteins.

Optimum Nutritional Pro Gainer has a very good protein to carb ratio of 60:85. Not only that, but it also contains healthy fats, vitamins, minerals, and healthy sugars to keep your body going through strenuous workouts while also keeping the weight and mass gain proportional.

Easy mixing

Even though you are taking something extra for your weight gain, you do not want your body to feel out of taste, which is why it is extremely necessary that the protein supplement that you choose mixes easily and smoothly with the food and beverage you take it with.

Optimum Nutrition Pro Gainer mixes very well, leaving no lumps in the drinks you consume which makes the consumption easier and more desirable.

Great flavor

A consumer’s first testing point is taste. No matter how much nutritional value a product offers, if it does not taste great, the consumer would likely end up rejecting it.

This is one reason that Optimum Nutrition Pro Gainer has made a special place in the hearts of the consumers. It tastes great. The vanilla flavor it comes in gives a soothing taste experience to the customers, thus increasing the desire for consumption.

Variety of flavors

Who doesn’t like variety, right? Well, the Optimum Nutrition Pro Gainer comes with a whole bunch of flavors to choose from. Its distinct taste lets the consumer have a chance to experiment with different flavors and choices and see what works for them.

Some flavors that it comes in include cookies and cream, banana, dark chocolate, vanilla, and strawberry. The choice makes the product more desirable as it gives the customers a chance to experiment.


Optimum Nutrition Pro Gainer is affordable. It comes in two sizes – tubs of 5 and 10 lbs. It is relatively cheaper than its market competitors and therefore does not go too hard on the customer’s pocket. Therefore, if you are looking to buy something healthy but also saves you from burning a hole in your pocket, this would be a good choice.

What Are Others Saying

I wanted to see what other people thought of the Optimum Nutrition Gainer in their own On Pro Complex Gainer review, too. Imagine my lack of surprise in finding that most of them liked it as much as I did!

As it turns out, LalaKae said it is the “best tasting protein shake” she has tried, Ricky M. claims that after starting to use it he was able to efficiently put on weight and exercise harder, and JP said he enjoys it more than other brands on the market!

Alternatives Options

Unfortunately, Optimum Nutrition Pro Gainer may not be the right product for everyone. If you want to try another remedy instead, here are a few alternatives:

BSN TRUE-MASS Weight Gainer

This product helps in gaining lean mass and is also useful for the growth and muscle recovery in the body. It is especially useful for athletes to gain appropriate body weight and to recover from any possible muscle injuries.

At 50 grams of protein, it doesn’t have quite the same support as Optimum Nutrition Pro Gainer’s formula, but it exceeds the calorie count at a whopping 700 calories per serving. Plus, it contains multiple whey protein sources that work together.


  • Variety of flavors
  • Multiple protein sources
  • Good taste


  • High sugar content
  • More calorie delivery
  • High-fat content

If you’re an athlete and you want quick recovery, try this remedy for yourself!

GNC Pro Performance Weight Gainer

This product is specially formulated to fulfill the nutritional needs of your body and provide the body with the essential amino acids. It helps reduce muscle breakdown during heavy workouts and training and replenishes the body’s energy.

It offers 50 grams of protein in each serving, as well as 700 calories. However, the carb content is staggeringly high for true gainers at 116 grams per serving.


  • Mixes well
  • Good taste
  • Free of banned substances
  • More affordable option


  • Can increase appetite abnormally
  • Can affect cardiovascular health
  • High carb content

If you feel your body lacks energy during exercise, this product can work for you.

Real Gains Weight Gainer

This product helps in gaining mass and is especially useful for sportsmen who are aiming to make weight and gain appropriate and proportionate body mass. The Real Gains formula offers 53 grams of protein in every serving, and it has 602 calories in each serving.

To preserve freshness, the Real Gains Weight Gainer offers a resealable bag, which is much easier to travel with when it comes to trips to the gym.


  • Easy to digest
  • Variety of flavors
  • Provides healthy fats
  • Good amino acid profile


  • Can have artificial substances
  • Average taste
  • Too much fat
  • More expensive

Anyone looking to gain body mass and weight especially in bulk ranges on and off-season should try this product.


Optimum Nutrition Gainer is a great choice if you are looking for a healthy, low-sugar protein powder for muscle, mass, and weight gain. It comes in a variety of flavors and gives you a wide variety of choices. Did my ON Pro Gainer review help you decide whether you want to purchase it or not? If yes, what are you waiting for? Check it out here!

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